let arr = new Array(5, 4, 3, 2, 1);

let arr1 = [5, 4, 3, 2, 1];

console.log(arr);
console.log(arr1);
console.log(arr.length);
console.log(arr1.length);

arr[0];

let str = arr.join("-");
console.log(str);
let c = arr.slice(1, 3);
console.log(c);

arr.push(99);

console.log(arr);

arr[7] = "abc";
console.log(arr);
console.log(arr.length);

